1 Division of General Internal Medicine, School of Medicine, University of Colorado, Denver2Hospital Medicine Program, Veterans Affairs Eastern Colorado Healthcare System, Denver.
2 Harborview Injury Prevention and Research Center, University of Washington, Seattle4Department of Epidemiology, School of Public Health, University of Washington, Seattle.
3 Harborview Injury Prevention and Research Center, University of Washington, Seattle5Department of Pediatrics, School of Medicine, University of Washington, Seattle.